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Highly Kinked Uranyl Chromate Nitrate Layers in the Crystal Structures of A [(UO 2 )(CrO 4 )(NO 3 )] ( A = K, Rb)
Author(s) -
Siidra Oleg I.,
Nazarchuk Evgeny V.,
Krivovichev Sergey V.
Publication year - 2012
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201200009
Subject(s) - monoclinic crystal system , uranyl , crystallography , chromate conversion coating , uranyl nitrate , electron microprobe , chemistry , crystal structure , uranium , hydrothermal synthesis , x ray crystallography , octahedron , hydrothermal circulation , materials science , diffraction , mineralogy , chromium , metallurgy , organic chemistry , optics , physics , seismology , geology
Two first uranyl chromate nitrates, K[(UO 2 )(CrO 4 )(NO 3 )] ( 1 ) and Rb[(UO 2 )(CrO 4 )(NO 3 )] ( 2 ), were prepared by solid‐state reactions and characterized by electron microprobe analysis and single‐crystal X‐ray diffraction. The compounds are isotypic [ 1 : monoclinic, P 2 1 / c , a = 9.881(5), b = 7.215(4), c = 14.226(6) Å, β = 124.85(3)°, V = 832.3(7) Å 3 ; 2 : monoclinic, P 2 1 / c , a = 9.804(1), b = 7.359(1), c = 14.269(1) Å, β = 122.048(4), V = 872.6(1) Å 3 ]. The structures of 1 and 2 are based upon the complex [(UO 2 )(CrO 4 )(NO 3 )] – layers with unprecedented structural topology, which consist of the Ur O 3 NO 3 units linked through CrO 4 tetrahedra. The resulted kinked layer can be divided into chains arranged in the ladder fashion. The layers are parallel to (100) and are linked by A + ( A = K, Rb) cations located between the layers.